Method and mold for casting hollow metal articles



June 17, 1930. A. LAW 1,763,895

METHOD AND MOLD FOR CASTING HOLLOW METAL ARTICLES Filed Feb. 27, 1929 5Sheets-Sheet l g A awvcn for;

J 5 e r? I. a w- 35 711 S aft-014 a June 17, 1930. A. LAW 1,763,895

METHOD AND MOLD FOR CASTING HOLLOW METAL ARTICLES Filed Feb. 27, 1929 aSheets-Sheet 2 Fl .5 Q 9 16 15 15E I U a Fig.6. a

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June 17, 1930.

METHOD AND MOLD FOR CASTING HOLLOW METAL 3 Sheets-Sheet 5 Filed Feb. 27,1929 L lrzzl LII filler? Law Patented June 17, 1930 Urrs STATE rsrorsics METHOD AND MOLD FOR CASTING HOLLOW METAL ARTICLES Applicationfiled February 27. 1929. Serial No. 342,966.

This invention relates essentially to a method and mold for castinghollow metal articles, particularly such as tubular pipe littings, andit is designed to provide a duplex pattern plate whereby the corecomposed of green sand is molded and the plate serves to impress theexterior of the relief portion of the patternlin the green sandcontained in the drag and cope.

An object of the invention is to provide a plate with cavities on oneside to form the core and protuberances or relief patterns located inthe reverse side of the plate for impressing one half of the pattern inthe sand of the drag and the other half in the sand of the cope.

Another object of the, invention is to provide a vent plate forimpressing channels in the half section of the core after the sand ispoured and rammed into the cavities of the pattern plate.

Another object of the invention is to provide the pattern plate witharbors suspended in the cavities and locking means adapted forwithdrawal from the exterior of the plate after one half of the core isfinished. In this arrangement the arbors, after the two sections of thecore are formed, constitute supports whereby the core is floated orpositioned in spaced relation to the pattern impressed in the sand ofthe drag and cope.

Another object of the invention is the method of impressing one half ofthe pattern in the drag and the other half in the cope by the use of aplate having protuberances or patterns in relief and then using thereverse cavity side of the plate to mold the two sections of the core.k,

The novel combinations of the invention are more fully described in thefollowing specification and claims, reference being made to theaccompanying drawings in which:

Fig. 1 represents a plan view of a pattern plate embodying thisinvention.

Fig. 2 is a side view of the same.

Fig. 3 is a section taken along the line 3-3 of Fig. 1.

, Fig. 4 is a similar section taken alongthe line el -4 of Fig. l. 7

Fig. 5 is a plan view of the core vent plate. Fig. 6 is a side elevationof the same.

Fig. 7 is a side elevation showing the method of molding the drag. I

Fig. 8 is an inverted plan view of the pattern plate showing the arborskeyed in the cavities.

Fig. 9 is a side elevation showing the method of molding the cope.

Fig. 10 is a'detail section taken along the line 10-10 of Fig. 8.

11 shows the flask prepared for casting.

As; indicated in Figs. 1 to 4, the numeral 5 designates a pattern platewhich is provided with protuberances 6 at the top and cavities 7 atthebottom of the plate, it also has portion 6 to form core prints. Theplate also has lateral flanges 8 made to form'handgrips for actuatingthe plate and ears 9 each with a hole 10 serve to align the plate on anob ect, as hereinafter described.

In Figs. 5 and 6 is shown a vent plate 11 having longitudinal andtransverse ribs 12 and it has side flanges 14 for manipulating theplate. The configuration of the ribs can be varied depending on theshape of the art cle to be cast. The core vent plate is furnlshed with aplurality of ears 15 each havng a pin 16 for engagement with the holesin the ears of the pattern plate. A drag 17 hav ng similar ears 18 tocoac't with the pins 16 is arranged I over the pattern plate, as shownin Fig. 7 i

As indicated in Fig. 8, the cavities have suspended therein arbors 19supported on notched shoulders'QO formed in the wall of the cavity.These arbors extend longitudinally and transversely, but the arrangementcan be changed to suit different shaped cores. A locking key 21 with ahandle 22 extends inwardly through a bore in the plate 5 and it has abevelled end124 best seen in Fig. 10 to contact with the face of thearbor so as to prevent the arbors from dropping out when the plateisreversed.

In Fig. 9 is shown a cope 25 having ears 26 with a pin 27 fixed to eachear in order to align the cope with the attern plate or with the drag. l

The method of molding the core and making the impressions of the patternin the sand of the drag and cope is as follows Place the pattern platehaving the arbors positioned in the cavity with its core side up, ram upthe core side of the plate pattern and strike ofl' the sand. Place thecore vent plate with its ribs against the core face of the pattern andreverse to the position shown in Fig. 7. The drag 17 is then slid ontothe pattern plate, the relief pattern beingon top,

ram the sandin the drag then lift off and set aside. The halfof the coreand'th'e pattern is then formed by lifting off the pattern plate andleaving the core resting on the core vent plate, then take the drag halfof the flask and position it over the core which rests on the core ventplate,'reverse and then remove the core vent plate, and the drag half ofthe moldiis complete. Insert the pins on the ears ofthe cope through theholes in the ears of the pattern plate with its core side up, asindicated in Fig. 9', set the locking pins for the arbors, ram up andstrike off the surplus sand, reverse and placethe upper half of the coreon top of the drag thereby completing the entire core. Ram up thesand'in the cope with the relief ofthe plate on top, strike off andpunch a 'sprue hole 28 through the sand to communicate with the space 29between the face of the'core and the surface of thejpatterns impressedinthe sand of the saidplatehaving'a'cavity in'thereverse side whereby aportion of the core isproduced.

2;; An apparatus for forming a mold in which; to cast hollow metalarticles com-; prising a plate with protuberantpatterns in relief on oneside for impressing in thesand containedin the'flask one portion of amold, said plate'havinga cavity in the reverseside whereby a portionofthe core is produced and a plate adapted to cooperate withsaid patternplate having means thereonto form ventsin' the core; Y

3.;An' apparatus for forming a mold in which to 'cast hollow metalarticlescomp'risingf;aplate with protuberant patternsinrelief-on-oneside for impressing inthe sand contained in the flask oneportion'of a mold,

said plate having a cavity in'its' reverse side for produclng aportionof a core; bores'located in the wall of thecavity, meanslocatedin the cavity wall for supporting an arbor, and locking means extendingthrough said bores coacting with the arbor to prevent 7 it from droppingout of'the cavity when reversing the plate.

' 4. The method of forming a mold for casting hollow metal articleswhich consists in taking a plate provided with patterns in relief on oneside and cavities in the reverse side with cavity side uppermost, saidcavities having arbors therein, filling the cavities with sand,placin'g'a core vent plate over the cavity side of the pattern plate,reversing both pattern and vent plates, placing the drag over the reliefside of the pattern plate, filling the drag with sand, lifting off thedrag, removing the pattern plate, positioning the drag over the halfcore resting on the vent plate, reversing the drag and vent plateandremoving the vent plate thereby completing one-half of a mold with ahalf core lying therein, then taking saidpattern plate with cavity sideuppermost and having core arbors locked therein and filling the cavitieswith sand and placing it overv .the aforesaid half of the finished mold,releasing the locking device, lifting off the pattern plate, taking thepattern platewith relief side up, placing the cope over said plate andfilling it with sand, removing the co efrom the pattern plate andpositioning t e cope over the finished half mold thereby completing theentire mold.

5. The method of forming the drag-half of a mold for casting hollowmetal articles which consists in taking a plate provided with patternsin relief on one side and cavities in the reverse side with the cavityside'uppermost, placing arbors in the cavities, filling the cavitieswith sand, placing a core vent plate with vent forming ribs therein overthe cavity side of the pattern plate, reversing both the pattern plateand vent plate to bring the relief side of the pattern plate uppermost,placing the drag over the relief side i of the pattern plate, filling upthe drag with sand, lifting off and setting aside the drag,

lifting off the pattern plateleaving one-half of the core resting onthe'vent plate, positioning, the drag over the half core resting on thevent plate, reversing the mold, removingthe vent plate wherebyone-halfof a mold with a half core lying therein is completed.

.6. The method of forming the cope part of a mold for casting. hollowmetal articles which consists in usinga plate with patterns andcorresponding cavities with the c'avity side uppermost, placing andlocking arbors in the cavities, filling the cavities with sand,reversing the plate with cavity side down and placing'it over thefinished drag part of a mold, releasing the'lockingldevice, lifting offthe pattern plate whereby the upperhalf of the core lies on the lowerhalf of the core, taking the pattern plate with-the relief side up,placing the cope over said plate, filling it with sand, punching a spruehole through the cope, removing the cope from the attern plate,positioning the cope over the nished drag mold. thus forming a, completemold.

In testimony whereof I have hereunto set my hand.

ALBERT LAW.

